robenstein45
Ok I have a Doc Johnson one and the suction dome is too big so it does not work. Anyone know one that works I can order online?
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Hank Alvarez
Robenstein45: Have you contacted Doc Johnson regarding this? They do a lot of R&D on their products, (That sounds like a lot of fun), and they spend a lot of money on their development. I'm sure they'd want to know if there's a problem.

Have you considered changing it yourself, (The tip that's too big)? Again this may be something Doc Johnson could help you with or at least advise you on. If nothing else you'll probably find something to adapt in a good auto parts store, (No pun of humor intended). HHH 
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